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Mössbauer study of transformation mechanism of Fe cations in olivine after thermal treatments in air

  • K. Barcova
  • M. Mashlan
  • R. Zboril
  • P. Martinec
Article

Abstract

The transformation mechanism of Fe cations in natural olivine after thermal treatments in air has been studied using mainly57Fe Mössbauer spectroscopy. γ-Fe2O3 nanoparticles appear as the primary Fe3+ phase in Mössbauer spectra of olivine samples heated at 600-900 °C. These nanoparticles are thermally unstable and they are transformed to α-Fe2O3 with the increase of heating time. Another transformation mechanism of iron related with the complete decomposition of olivine structure has been observed at temperatures of 1000 °C and higher. The mixed oxide MgFe2O4 with the spinel structure and enstatite MgSiO3 were identified as iron-bearing decomposition products.

Keywords

Oxide Iron Olivine Thermal Treatment Mixed Oxide 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers/Akadémiai Kiadó 2003

Authors and Affiliations

  • K. Barcova
    • 1
  • M. Mashlan
    • 1
  • R. Zboril
    • 2
  • P. Martinec
    • 3
  1. 1.Department of Experimental PhysicsPalacky UniversityOlomoucCzech Republic
  2. 2.Department of Inorganic and Physical ChemistryPalacky UniversityCzech Republic
  3. 3.Institute of GeonicsAcademy of Sciences of the Czech RepublicOstravaCzech Republic

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